pidgin/pidgin

Remove unused conversation-timestamp signal.

2020-10-29, Elliott Sales de Andrade
2b0b603bd39a
Remove unused conversation-timestamp signal.

It is registered, but never emitted.

Testing Done:
Built docs.

Reviewed at https://reviews.imfreedom.org/r/180/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False